[issue32269] Add `asyncio.get_running_loop()` function

[Yury Selivanov]

Yury Selivanov <yselivanov at gmail.com> added the comment:

> `asyncio._get_running_loop()` will be deprecated and removed in Python 3.9.

_get_running_loop() was left as-is.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue32269>
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